[vtkusers] expose slowness under X windows

[John Hunter]

>>>>> "Jeff" == Jeff Lee <jeff at cdnorthamerica.com> writes:

    Jeff> try printing out renWin->ReportCapabilities() and look for
    Jeff> hardware support.  -Jeff

I get lines like

    server glx vendor string:  NVIDIA Corporation
    server glx version string:  1.3
    server glx extensions:  GLX_EXT_visual_info GLX_EXT_visual_rating GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_ARB_multisample GLX_NV_float_buffer
    client glx vendor string:  NVIDIA Corporation
    client glx version string:  1.3
    client glx extensions:  GLX_ARB_get_proc_address GLX_ARB_multisample GLX_EXT_visual_info GLX_EXT_visual_rating GLX_EXT_import_context GLX_SGI_video_sync GLX_SGIX_swap_group GLX_SGIX_swap_barrier GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_NV_float_buffer
    glx extensions:  GLX_EXT_visual_info GLX_EXT_visual_rating GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_ARB_multisample GLX_NV_float_buffer GLX_ARB_get_proc_address  
    OpenGL vendor string:  NVIDIA Corporation
    OpenGL renderer string:  GeForce FX 5200/AGP/SSE2
    OpenGL version string:  1.4.0 NVIDIA 44.96

all of which look good to my untrained eye....

I'll do some research into the nvidia driver...

JDH